Do you know what the SAE connector is?

Do you know what the SAE connector is?

The SAE connector is a physically self-mating hermaphroditic two-conductor DC connector commonly used in solar and automotive applications. It is named after the Society of Automotive Engineers that created the specification on which this connector is based.

Although the plugs are physically hermaphroditic and any SAE connector can be connected to any other SAE connector, they are not electrically hermaphroditic and care needs to be taken to maintain correct polarity when connecting different plugs to each other.

This connector is often used to impose maintenance costs on vehicle batteries. The polarity of the connector, when installed in a vehicle and connected to the battery, will never cause a short circuit if the exposed terminals touch the vehicle chassis. In most vehicles, this means that the exposed terminal is connected to the negative terminal of the battery. Instead, the positive terminal on the battery charger is exposed to mate with the hidden positive terminal on the vehicle side.